Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9af9de6b3d511ec…

MALICIOUS

PDF

74.6 KB Created: 2021-04-06 18:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ec9987cc18f1e19092c66b63a814efe SHA-1: 2ac6c844dac334907f270466f9eae96ff42f3cb9 SHA-256: b9af9de6b3d511ec339041e627a597c56999109fce9758cdaea051424ad3335f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/123?utm_term=best+android+minecraft+mods PDF link annotation
    • https://cdn.sqhk.co/figotabam/GgcijQ9/nizatulomadalonuzumibisob.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/gmhdghj/13684891031.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/21745451405.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/sobetevod/W3hgXjf/67966996669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb38234f-8bc5-4c34-8556-cca72908eac3/dejaja.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/75486747647.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/bksb_initial_assessment_english_answers.pdfIn PDF document text
    • http://derefoxawuziten.rf.gd/asuran_2019_movie_hd.pdfIn PDF document text
    • http://gusizozubamu.epizy.com/advanced_english_synonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23f1da1-9778-4b2d-8bdd-6aefa5a30913/18296539653.pdfIn PDF document text
    • http://raburuterurova.rf.gd/duzekabib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2102674c-7c2c-4b11-a983-c01401a107d1/xofizunirorep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b1519e-b025-42b0-b382-13d8469c38ea/dofagamede.pdfIn PDF document text
    • http://renabije.rf.gd/how_to_collect_your_small_claims_judgement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11bbbae4-daad-4c6b-a899-85e2cef97fb8/64773854299.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/42897986121.pdfIn PDF document text
    • http://fujeximadotut.rf.gd/bekarobabatugav.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/toluwigodulolina.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/xerivixisajota.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 5184 bytes
SHA-256: 35f69455204b890f7d918a1ee2659ffef69b8f46c79c5f4c12b97174a4b9f14e
font_01_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 9972 bytes
SHA-256: c0cab4047fe87f503f58565b705653f9abe40fdc35e669ddf16d3e522bce459e

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